A series circuit has one path for electrons to flow between any two points, so if one component breaks the entire circuit is broken. A parallel circuit has multiple paths so if one component breaks the other paths remain intact. In a series circuit, the current through each resistor is the same while the overall resistance is the sum of individual resistances. In a parallel circuit, the voltage across each resistor is the same while the overall resistance is calculated by taking the inverse of the sum of the inverses of individual resistances. Electric power represents the rate of energy conversion and is measured in watts, while electric energy represents the presence and flow of electric charge and is measured in watt-hours by electric meters.

1. SERIES &
PARALLEL
CIRCUITS
Electric Power and
Energy

4. SERIES CIRCUIT:
-There is only ONE PATH for
the electrons to take between
any two points in the circuit.
*There will be no alternative
route.
-Has more than one
RESISTOR. Since there is only
one path for the current to
travel, the current through each
of the resistors is the same.
*Resistors are components that
are used to control the amount
of current flowing in a circuit.

7. PARALLEL CIRCUITS:
-Two or more components are
connected between the same
two points.
- Has more than one resistor
and gets its name form having
multiple paths to move along.
* Charges can move through
any of the several paths. If
one of the items in the circuit is
broken, then no charge will
move through that path. But
other paths will continue to have
charges flow through them.

9. RECAP! 
SERIES CIRCUIT PARALLEL
CIRCUIT
DESCRIPTION If one the items in the If one of the items in
circuit is broken, then the circuit is broken
no charge will move then no charge will
through the circuit move through that
because there is only path, but OTHER
ONE PATH. PATHS will continue
to have charges flow
through them.
RESISTOR As more resistors are As the number of
added, the overall resistors increases,
current in the circuit the overall current
decreases. also increases.

10. EQUIVALENT RESISTANCE
-Is the amount of resistance that a single resistor
would need in order to equal the overall effect of
the collection of resistors that are present in the
circuit.
RESISTORS IN SERIES:
Two resistances are connected in series if all
the current from one resistor must flow through
the second; there is no alternative route.

11. Equivalent resistance:
From conservation of
I1 = I2 = I
charge:
where I is the current through the combination.
From conservation of
V1 + V2 = V
energy:
where V is the potential difference across both
resistors.
The two resistors can be replaced by a single
resistor with the equivalent resistance
For more than two resistors, Req = R1 + R2 + R3 + ...

12. RESISTORS IN PARALLEL:
- Two resistors are connected in parallel if they
are joined at both ends such that the potential
difference across both resistors is the same. The
current splits, flows through the two resistors, then
comes back together with no alternate path.

13. Equivalent resistance:
From
conservation of I1 + I2 = I
charge:
From
conservation of V1 = V2 = V
energy:
The two resistors can be replaced by a single
resistor with the equivalent resistance Req:
For more than two resistors:

14. RECAP! 
SERIES CIRCUIT PARALLEL CIRCUIT
The total resistance of the The inverse of the total
circuit, also called effective resistance of the circuit, is
resistance is equal to the equal to the sum of the
sum of the individual inverses of the individual
resistances. resistances.
R = R 1 + R2 + R3 + … 1/R = 1/R1 + 1/R2 +
1/R3 + …

15. ELECTRIC POWER AND ENERGY
Electric Power:
- Represents the rate at which energy is
converted from the electrical energy of the
moving charges to some other form.
- The SI unit of power is watt.
Electric Energy:
-Represents the presence and flow of an electric
charge. The energy portion of electricity is found
in a variety of phenomena such as static
electricity, electromagnetic fields and lightning.
-Consumption of electrical energy is measured
by Watt x Hour (Wxh)
* 1Wh = 3600 joule = 859.8 calorie

16. ELECTRIC METER
-An instrument that measures the amount of electric
energy by a consumer.
-The meter is calibrated in kilowatt – hours.
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When the hand of one of the dials is between numbers, always take the
smaller number. you cannot tell if a hand is past a number or not, simply
look at the dial to the right. If it has passed zero, then the hand is
pointing to the correct number. If the dial to the right has not passed
zero, then use the next smaller number.

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